Method of improving biomass yield of lactic acid bacterial...

C - Chemistry – Metallurgy – 12 – N

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C12N 1/20 (2006.01) C12N 1/04 (2006.01)

Patent

CA 2414628

A method of enhancing biomass yield of a lactic acid bacterial species cell culture, comprising cultivating the cells in a process comprising the steps of providing conditions that results in a reduced glycolytic flux and providing conditions that enable the cells to have, under aerobic conditions, a respiratory metabolism. The increased yield of biomass may be the result of an increased yield of ATP which can be obtained by activating the native ATP synthase activity of the H+-ATPase complex by lowering the ATP/ADP ratio, e.g. by carbon source limitation, and/or by increasing the proton gradient (membrane potential) of the cells, e.g. by enhancing or establishing an electron transport chain which can be achieved by enhancing expression of dehydrogenases or electron transport chain components, by adding to the medium a quinone or porphyrin compound or by enhancing the expression of the H+- ATPase activity.

L'invention concerne un procédé permettant d'améliorer le rendement de la biomasse à partir de la culture cellulaire d'espèces bactériennes d'acide lactique. Ce procédé consiste à cultiver les cellules dans des conditions résultant d'un flux glycolytique réduit, et dans des conditions permettant à des cellules de présenter un métabolisme respiratoire dans des conditions aérobiques. L'augmentation du rendement de la biomasse peut être le résultat de l'augmentation du rendement d'ATP obtenu par activation de l'activité de l'ATP synthase native du complexe H?+¿-ATPase par réduction du rapport ATP/ADP (par exemple par limitation de la source carbonique), et/ou par augmentation du gradient de protons (potentiel membranaire) des cellules (par exemple par amélioration ou établissement d'une chaîne de transport d'électrons obtenue par amélioration de l'expression des déshydrogénais ou des composants de ladite chaîne de transport d'électrons, par adjonction d'un composé de quinone ou de porphyrine dans le milieu ou par amélioration de l'activité de la H?+¿-ATPase).

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